The powers of the courts of quarter sessions of this commonwealth, to vacate public and private roads, are hereby extended to all roads, whether laid out by authority of law, or existing by prescription or lapse of time; and generally to all roads, except private roads, resting upon express grant, the evidence of which is still in existence, excepting in such counties, as the power to lay out and vacate public roads is, or may be, vested in some other tribunal, than in the court of quarter sessions of the peace; excepting, also, roads laid out by act of assembly, and are expressly exempted from the jurisdiction of said courts.